WO2022059748A1

WO2022059748A1 - Machine tool, positional information correction method, and positional information correction program

Info

Publication number: WO2022059748A1
Application number: PCT/JP2021/034181
Authority: WO
Inventors: 龍也並木
Original assignee: シチズン時計株式会社; シチズンマシナリー株式会社
Priority date: 2020-09-20
Filing date: 2021-09-16
Publication date: 2022-03-24
Also published as: JPWO2022059748A1; US20230356344A1; EP4215311A1; CN116157231A; TW202227222A; KR20230069911A

Abstract

Provided is a machine tool comprising: a spindle that rotatably grips a workpiece; a blade mount on which a tool for processing the workpiece can be mounted; a moving body that is movable independently from the spindle and the blade mount; a contact type sensor that moves according to movement of the moving body; and a control device that calculates central position information indicating the central position of the spindle on the basis of spindle position information obtained via the sensor having been moved to the vicinity of the workpiece by moving the moving body. The control device obtains blade edge position information indicating the position of a blade edge of the tool via the sensor by moving the moving body, and corrects the blade edge position information on the basis of the central position information.

Description

Machine tools, location information correction methods, and location information correction programs

This disclosure relates to machine tools, position information correction methods, and position information correction programs.

In machine tools such as turning centers and machining centers, various techniques for detecting the position of a tool for machining a workpiece are known. For example, there is known a technique in which a tool is manually brought into contact with a work, a positional relationship between the cutting edge of the tool and the work is measured, and the position of the tool is input to an NC device as an offset. Further, there is known a technique called an out-of-machine preset in which a tool holder attached by adjusting the position of a tool in advance by a measuring jig also called a presetter is attached to a machine tool. However, these techniques have various problems such as a long machine tool stop time and an increase in operator labor.

In order to solve these problems, a technique for automatically measuring the positional relationship between a work and a tool in a machine tool is known. For example, in Japanese Unexamined Patent Publication No. 2008-202988, the center coordinates of the work measured by the probe are used as the reference position based on the positional relationship between the tip of the stylus of the probe for measuring the center coordinates of the work and the cutting edge of the tool. Disclosed as a machine tool that defines the position of the cutting edge of the tool. Further, in Japanese Patent Application Laid-Open No. 2000-198047, the spindle center line measured by abutting the detection unit of the sensor mounted on the turret against the work, and the tool and the sensor mounted on the turret together with the sensor are provided. A machine tool that calculates the position of the cutting edge of the tool with respect to the center line of the spindle is described from the positional relationship.

However, in the techniques described in JP-A-2008-200798 and JP-A-2000-198047, the center position of the work is measured, but the position of the cutting edge of the tool is not measured. In the techniques described in JP-A-2008-200798 and JP-A-2000-198047, the position of the cutting edge of the tool is not measured, so that the position of the cutting edge of the tool is displaced due to heat generation due to machining of the work or the like. At that time, the positional relationship between the work and the tool may include an error due to the displacement of the position of the cutting edge of the tool.

The object of the present disclosure is to provide a machine tool capable of accurately measuring the positional relationship between a work and a tool.

The machine tool according to the present disclosure includes a spindle that rotatably grips the work, a tool post on which a tool for processing the work can be installed, a moving body that can move independently of the spindle and the tool post, and the movement of the moving body. A control device that calculates the center position information indicating the center position of the spindle based on the spindle position information acquired through the contact type sensor that moves according to the procedure and the sensor that is moved to the vicinity of the work by moving the moving body. By moving the moving body, the control device acquires the cutting edge position information indicating the position of the cutting edge of the tool via the sensor, and corrects the cutting edge position information based on the center position information.

Further, in the machine tool according to the present disclosure, the control device moves the moving body so that the center position of the sensor coincides with the center axis of the spindle, and moves the tool post to bring the cutting edge of the tool into contact with the sensor. Therefore, it is preferable to acquire the cutting edge position information.

Further, in the machine tool according to the present disclosure, the sensor has a columnar support member and a detection unit having a plurality of contacts arranged on the peripheral surface of the support member, and the central position of the sensor is the central axis of the main axis. Moving the moving body so as to match preferably includes moving the moving body so as to coincide with the central axis of the support member and the central axis of the main axis.

Further, in the machine tool according to the present disclosure, the plurality of contacts include four contacts arranged 90 degrees apart from each other on the peripheral surface of the support member, and are arranged 180 degrees apart included in the four contacts. The distance between the pair of contacts is preferably the same as the diameter of the work.

Further, in the machine tool according to the present disclosure, it is preferable that the moving body is a back spindle that can be arranged to face the spindle.

Further, the position correction method according to the present disclosure includes a spindle that rotatably grips the work, a tool post on which a tool for processing the work can be installed, and a moving body that can move independently of the spindle and the tool post. The center position information indicating the center position of the spindle is calculated based on the spindle position information acquired through the contact type sensor that moves according to the movement of the body and the sensor that is moved to the vicinity of the work by moving the moving body. It is a position correction method executed by the control device in the machine tool having the control device, and the control device moves the moving body to obtain the cutting edge position information indicating the position of the cutting edge of the tool via the sensor. It includes acquiring and correcting the cutting edge position information based on the center position information.

Further, the position correction program according to the present disclosure includes a spindle that rotatably grips the work, a tool post on which a tool for processing the work can be installed, and a moving body that can move independently of the spindle and the tool post. The center position information indicating the center position of the spindle is calculated based on the spindle position information acquired through the contact type sensor that moves according to the movement of the body and the sensor that is moved to the vicinity of the work by moving the moving body. In a machine tool having a control device, the cutting edge position information indicating the position of the cutting edge of the tool is acquired through the sensor by moving the moving body, and the cutting edge position information is corrected based on the center position information. Let the controller do it.

The machine tool according to this disclosure can accurately measure the positional relationship between the work and the tool.

It is a perspective view of the machine tool which concerns on embodiment. FIG. 2 is a perspective view of the back main shaft shown in FIG. 1 and the front tool post arranged adjacent to the back main shaft. It is a flowchart of the position information correction processing executed by the machine tool shown in FIG. It is a figure for demonstrating the process of S102 shown in FIG. 3, (a) is the perspective view of the back main shaft and the guide bush device, and (b) is the front view of the guide bush device. It is a figure for demonstrating the process of S103 shown in FIG. 3, (a) is the perspective view (the 1) of the rear spindle and the guide bush device, (b) is the perspective view of the rear spindle and a guide bush device (b). Part 2).

Hereinafter, the machine tool, the control method of the machine tool, and the control program of the machine tool will be explained with reference to the drawings. However, it should be understood that the invention is not limited to the drawings or embodiments described below.

FIG. 1 is a perspective view of a machine tool according to an embodiment.

The machine tool 1 has a bed 10, a front spindle 11, a rear spindle 12, a guide bush device 13, a tool post 14, and an NC device 20. A front spindle 11, a rear spindle 12, a guide bush device 13, and a tool post 14 are mounted on the bed 10. The front spindle 11 is a hollow member capable of gripping the columnar work W1 and can move in the Z1 direction by being installed in a moving mechanism that moves along the rail 15. The rear spindle 12 is a hollow member capable of gripping the columnar work W2, and can move in the Z2 direction and the X2 direction by being installed on a moving mechanism that moves along the

rails

16 and 17. The guide bush device 13 is fixed to the bed 10 and supports the work W1 gripped by the front spindle 11 so as to be slidably guided in the Z1 direction. The tool post 14 is a member that holds a plurality of tools for processing the workpieces W1 and W2 gripped by the front spindle 11 and the rear spindle 12, and is installed on a moving mechanism that moves along the

rails

18 and 19. It is possible to move in the X1 direction and the Y1 direction. The rotation and movement of the front spindle 11, the rear spindle 12, and the tool post 14 are controlled by the NC device 20 mounted on the machine tool 1. The front spindle 11, the rear spindle 12, and the tool post 14 can move independently of each other, that is, independently of each other. The NC device 20 is a control device having a calculation circuit, a storage circuit for storing a position correction program for executing position information correction processing, and the like, and instructing various operations of the machine tool. The position correction program may be installed in the management storage unit 42 from a computer-readable portable recording medium such as a CD-ROM or a DVD-ROM using a known setup program or the like.

FIG. 2 is a perspective view of the rear main shaft 12 and the front blade base 21 arranged adjacent to the back main shaft 12.

The front turret 21 is also referred to as an opposed turret, and is a member that holds a rotary tool 22 such as a drill, a non-rotating tool 23, and a tool setter 24, and moves integrally according to the movement of the rear spindle 12. The tool setter 24 is a contact-type position sensor having a columnar support member 25 and a detection unit 26 arranged on the peripheral surface of the tip of the support member 25. The detection unit 26 has four contacts arranged 90 degrees apart from each other on the peripheral surface of the support member 25, and the four contacts come into contact with the target member such as the work W1 in the X2 and Y2 directions, respectively. The position of the target member is detected from a total of 4 directions, 2 directions each.

In the tool setter 24, the distance between the pair of contacts included in the four contacts of the detection unit 26 and arranged at a distance of 180 degrees may be smaller or larger than the diameter of the work W1 to be machined. It suffices if the work W1 can be contacted with four contacts. Further, it is preferable that the distance between the pair of contacts is selected so as to be the same as the diameter of the work W1 because the work W1 is closer to the machining point to be machined. Here, when the distance between the pair of contacts is 0.8 times or more and 1.2 times or less the diameter of the work W1, the distance between the pair of contacts is considered to be the same as the diameter of the work W1. To.

FIG. 3 is a flowchart of the position information correction process executed by the machine tool 1. The position information correction process shown in FIG. 3 is executed in cooperation with each other while controlling each element of the machine tool 1 by a command from the NC device 20. Further, the position information correction process shown in FIG. 3 may be executed before the work W1 is machined by the tool, or may be appropriately executed while the work W1 is machined by the tool. For example, the position information correction process shown in FIG. 3 may be executed immediately after the machine tool 1 is started, may be executed before the machining of the work W1 is started, and a predetermined number of machining may be performed from the work W1. It may be executed every time a finished work is formed.

First, the NC device 20 instructs the front spindle 11 to grip the work W1 (S101). The front spindle 11 grips the work W1 by a chuck (not shown) according to the instruction of the NC device 20.

Next, the NC device 20 instructs to acquire the spindle position information indicating the position of the front spindle (S102).

4A and 4B are views for explaining the process of S102, FIG. 4A is a perspective view of the rear main shaft 12 and the guide bush device 13, and FIG. 4B is a front view of the guide bush device 13. ..

The NC device 20 moves the tool setter 24 in the vicinity of the work W1 supported by the guide bush device 13 by moving the rear spindle 12. The NC device 20 acquires the spindle position information via the toolsetter 24 moved to the vicinity of the work W1.

First, as shown by the arrow A in FIG. 4B, the NC device 20 brings the detection unit 26 of the tool setter 24 into contact with the work W1 to provide the first position information P1 indicating the position of the upper end of the work W1. Obtained from the tool setter 24. Next, the NC device 20 brings the detection unit 26 of the tool setter 24 into contact with the work W1 as shown by the arrow B in FIG. 4B, and provides the second position information P2 indicating the position of the left end of the work W1. Obtained from the tool setter 24. Next, the NC device 20 brings the detection unit 26 of the tool setter 24 into contact with the work W1 as shown by the arrow C in FIG. 4B, and provides the third position information P3 indicating the position of the lower end of the work W1. Obtained from the tool setter 24. Next, the NC device 20 brings the detection unit 26 of the tool setter 24 into contact with the work W1 as shown by the arrow C in FIG. 4B, and provides the fourth position information P4 indicating the position of the right end of the work W1. Obtained from the tool setter 24. Then, the NC device 20 stores the first position information P1 to the fourth position information P4 acquired via the tool setter 24 as the spindle position information.

Next, the NC device 20 determines the center position of the front spindle 11 based on the spindle position information acquired by the processing of S102 via the toolsetter 24 moved to the vicinity of the work W1 by moving the back spindle 12. The indicated center position information is calculated (S103).

The NC device 20 uses the coordinates Px of the center position of the front spindle 11 in the X1 direction as the first position information P1 indicating one coordinate of the work W1 in the X1 direction and the third position indicating the other coordinates of the work W1 in the X1 direction. It is calculated as the center value (P1 + P3) / 2 of the information P3. Further, the NC device 20 sets the coordinate Py of the center position of the front spindle 11 in the Y1 direction as the second position information P2 indicating one coordinate of the work W1 in the Y1 direction and the second coordinate indicating the other coordinate of the work W1 in the Y1 direction. 4 Calculated as the center value (P2 + P4) / 2 of the position information P4.

Next, the NC device 20 instructs to acquire the cutting edge position information indicating the position of the cutting edge of the tool (S104).

5A and 5B are views for explaining the process of S104, FIG. 5A is a perspective view (No. 1) of the rear main shaft 12 and the guide bush device 13, and FIG. 5B is a rear main shaft 12 and a guide. FIG. 2 is a perspective view (No. 2) of the bush device 13.

The NC device 20 moves the rear spindle 12 so that the center position of the tool setter 24 coincides with the center axis of the front spindle 11, and moves the tool post 14 to move the cutting edge of the tool 140 held by the tool post 14. By contacting with the tool setter 24, the cutting edge position information is acquired.

First, in the NC device 20, as shown in FIG. 5A, the central axis of the support member 25 of the tool setter 24 is aligned with the central axis of the front main shaft 11, and the detection unit 26 of the tool setter 24 works. The rear main shaft 12 is moved so as to be close to W1. The NC device 20 has a rear spindle 12 so that the positions of the center of the support member 25 of the tool setter 24 in the X1 direction and the Y direction coincide with the coordinates (Px, Py) indicated by the center position information calculated in the process of S103. To move. Next, as shown in FIG. 5A, the NC device 20 brings the cutting edge of the tool 140 into contact with the tool setter 24 from one of the X1 directions of the tool post 14, and indicates the position of the lower end of the cutting edge. Information K1 is acquired from the tool setter 24. Next, as shown in FIG. 5B, the NC device 20 brings the cutting edge of the tool 140 into contact with the tool setter 24 from one of the Y1 directions of the tool post 14, and the second cutting edge position indicating the position of the right end of the cutting edge. Information K2 is acquired from the tool setter 24. From the first cutting edge position information K1 and the second cutting edge position information K2, the coordinates (Kx, Ky) of the cutting edge of the tool 140 in the X1 direction and the Y1 direction are calculated.

Then, the NC device 20 corrects the cutting edge position information acquired in the processing of S104 based on the center position information calculated in the processing of S103 (S105). The NC device 20 uses the coordinates (Px, Py) of the center position of the front spindle 11 included in the center position information in the X1 direction and the Y1 direction as a reference, and the coordinates (Kx, Ky) of the cutting edge of the tool 140 in the X1 direction and the Y1 direction. ) Is corrected to generate the corrected coordinates (Cx, Cy). In the correction coordinates (Cx, Cy), Cx is represented by (Px-Kx) and Cy is represented by (Py-Ky). The correction coordinates (Cx, Cy) generated in the process of S105 are the distances from the cutting edge position of the tool 140 to the work W1, Cx is also referred to as "diameter", and Cy is also referred to as "core".

Then, the position information correction process ends. After the position information correction process is completed, the machine tool 1 executes the machining process of the work W1 at the tool cutting edge position corrected based on the position information correction process by the tool 140.

Since the machine tool 1 measures the positions of both the work W1 and the tool 140 with a single tool setter 24, the positional relationship between the work W1 and the tool 140 can be corrected with high accuracy.

Further, the machine tool 1 aligns the center position of the tool setter 24 with the center axis of the work W1 so that the center position of the tool setter 24 coincides with the center axis of the front spindle 11, and the tool setter 24 is in the vicinity of the work W1. It can be approached (position when processing).

Further, since the machine tool 1 acquires the cutting edge position information indicating the cutting edge position of the tool 140 at a position close to the position where the work W1 is machined while the tool setter 24 is arranged in the vicinity of the work W1, the tool 140 works. It is possible to acquire the cutting edge position information with higher accuracy than when acquiring the cutting edge position information in a state of being separated from W1.

Further, the machine tool 1 calculates the center position information indicating the center position of the front spindle 11, and if the correction amount for the cutting edge position information based on the center position information is stored in advance, the correction amount is used as the work W1. The positional relationship with the tool 140 can be corrected. In this case, the tool setter 24 does not have to match the central axis of the work W1 with the center position of the tool setter 24.

Further, the machine tool 1 executes the position information correction process while the work W1 by the tool 140 is machined, so that even if the cutting edge of the tool 140 is worn, the position between the cutting edge of the tool 140 and the work W1. Relationships can be corrected with high accuracy. Further, the machine tool 1 can detect damage to the cutting edge of the tool 140 by executing the position information correction process while the work W1 by the tool 140 is being machined.

Further, when the tool setter 24 is selected so that the distance between the pair of contacts included in the detection unit 26 and arranged 180 degrees apart is the same as the diameter of the work W1, the cutting edge position information is displayed. , The work W1 is acquired at a position closer to the position of the tool 140 when it is machined. Since the distance between the pair of contacts of the tool setter 24 included in the detection unit 26 and arranged 180 degrees apart is the same as the diameter of the work W1, the accuracy of the cutting edge position information can be further improved.

Further, since the tool setter 24 is attached to the front blade base 21 that moves according to the movement of the rear spindle 12, the spindle position information and the spindle position information from the work W1 and the tool 140 can be obtained without separately arranging a member for moving the tool setter 24. It is possible to acquire the blade position information.

In the machine tool 1, the tool setter 24 is attached to a front blade base 21 that moves according to the movement of the rear spindle 12, but in the machine tool according to the embodiment, the contact type sensor is a moving body that moves the contact type sensor. It suffices to be held by.

Further, in the machine tool 1, the detection unit 26 of the tool setter 24 is arranged with contact portions so as to detect the X1 direction and the Y1 direction, but in the machine tool according to the embodiment, the detection unit of the tool setter is Z1. The contacts may be arranged so that the direction can be further detected. Since the detection unit of the tool setter can further detect the Z1 direction, the distance between the cutting edge position of the tool 140 and the work W1 is added to the "diameter" indicating the X1 direction and the "core" indicating the Y1 direction. It can be generated as three-dimensional coordinates including the "longitudinal" indicating the Z1 direction.

Further, in the machine tool according to the embodiment, the detection unit of the tool setter may be arranged with a contact unit so as to be able to detect either the X1 direction or the Y1 direction. For example, when the detection unit of the toolsetter can detect only the Y1 direction, the position information correction process executes the position information correction process only in the Y1 direction. The detector of the toolsetter may have only a single contact. When the detector of the tool setter has only a single contact, the tool setter is rotatably arranged around the Z1 direction.

Further, in the position information correction process described, the guide bush device 13 that supports the work W1 so as to be guided is provided, but the machine tool according to the embodiment does not have to have the guide bush device 13.

Claims

A spindle that rotatably grips the work and
A tool post on which tools for processing the work can be installed,
A moving body that can move independently of the spindle and the tool post,
A contact-type sensor that moves according to the movement of the moving body,
It has a control device that calculates center position information indicating the center position of the spindle based on the spindle position information acquired through the sensor moved to the vicinity of the work by moving the moving body. ,
By moving the moving body, the control device acquires the cutting edge position information indicating the position of the cutting edge of the tool via the sensor, and corrects the cutting edge position information based on the center position information. A machine tool that features.
The control device moves the moving body so that the center position of the sensor coincides with the center axis of the spindle, and moves the tool post to bring the cutting edge of the tool into contact with the sensor. The machine tool according to claim 1, wherein the cutting edge position information is acquired.
The sensor has a columnar support member and a detection unit having a plurality of contacts arranged on the peripheral surface of the support member.
Moving the moving body so that the central position of the sensor coincides with the central axis of the main axis includes moving the moving body so as to coincide with the central axis of the support member and the central axis of the main axis. , The machine tool according to claim 2.
The plurality of contacts include four contacts arranged 90 degrees apart from each other on the peripheral surface of the support member.
The machine tool according to claim 3, wherein the distance between the pair of contacts included in the four contacts and arranged 180 degrees apart is the same as the diameter of the work.
The machine tool according to any one of claims 1 to 4, wherein the moving body is a rear spindle that can be arranged facing the spindle.
A spindle that rotatably grips the work and
A tool post on which tools for processing the work can be installed,
A moving body that can move independently of the spindle and the tool post,
A contact-type sensor that moves according to the movement of the moving body,
A machine tool having a control device that calculates center position information indicating the center position of the spindle based on the spindle position information acquired through the sensor moved to the vicinity of the work by moving the moving body. A position correction method performed by the control device in a machine.
By moving the moving body, the cutting edge position information indicating the position of the cutting edge of the tool is acquired via the sensor.
Correct the cutting edge position information based on the center position information.
A position correction method, including that.
A spindle that rotatably grips the work and
A tool post on which tools for processing the work can be installed,
A moving body that can move independently of the spindle and the tool post,
A contact-type sensor that moves according to the movement of the moving body,
A machine tool having a control device that calculates center position information indicating the center position of the spindle based on the spindle position information acquired through the sensor moved to the vicinity of the work by moving the moving body. In the machine
By moving the moving body, the cutting edge position information indicating the position of the cutting edge of the tool is acquired via the sensor.
Correct the cutting edge position information based on the center position information.
A position correction program characterized in that a process is executed by the control device.